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      <div class="helptext"><pre><!--helptext -->  <span class="helptopic">prtKernelDirect</span>  Direct kernel
 
   kernelObj = <span class="helptopic">prtKernelDirect</span> Generates a <span class="helptopic">prtKernelDirect</span> object implementing a
   direct kernel function.  Kernel objects are widely used in several
   prt classifiers, such as prtClassRvm and prtClassSvm.  Direct kernels
   implement the following function for 1 x N vectors x1 and x2:
 
    k(x1,x2) = x2;
 
   Direct kernel functions can be used sparse machine learning contexts
   to perform sparse linear feature selection.
    
   <span class="helptopic">prtKernelDirect</span> objects inherit the TRAIN, RUN, and AND
   methods from prtKernel.
 
   % Example:
    ds = prtDataGenUnimodal;   % Load a data set
    k1 = <span class="helptopic">prtKernelDirect</span>;      % Create a <span class="helptopic">prtKernelDirect</span> object
    
    k1 = k1.train(ds);         % Train
    g1 = k1.run(ds);           % Run
 
    % Plot the results
    imagesc(g1.getObservations);</pre></div><!--after help --><!--seeAlso--><div class="footerlinktitle">See also</div><div class="footerlink"> <a href="./../prtKernel.html">prtKernel</a>,<a href="./../prtKernelSet.html">prtKernelSet</a>, <a href="./../prtKernelDc.html">prtKernelDc</a>,
    <a href="./../prtKernelHyperbolicTangent.html">prtKernelHyperbolicTangent</a>, <a href="./../prtKernelPolynomial.html">prtKernelPolynomial</a>, <a href="./../prtKernelRbf.html">prtKernelRbf</a>,
    <a href="./../prtKernelRbfNdimensionScale.html">prtKernelRbfNdimensionScale</a>, 
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